J. Phys. IV France 125 (2005) 241-243
Crystallinity evolution in ceramic materials monitored by thermal diffusivityR. Toledo1, D.R. dos Santos1, R.T. Faria Jr.1, L.C.M. Miranda2, L.T. Auler1 and H. Vargas1
1 Universidade Estadual do Norte Fluminense Darcy Ribeiro - UENF, Av. Alberto Lamego, CEP: 28013-602, 2000 Campos dos Goytacazes, RJ, Brazil
2 Instituto Nacional de Pesquisas Espaciais - INPE, Av. dos Astronautas, CEP: 12227-010, 1758 São José dos Campos, SP, Brazil
In this work, we present a detailed analysis of the thermal and crystalline evolution in ceramic samples produced from natural soil and heated at different temperatures, ranging from 300 to 1200ºC. The crystalline and amorphous volumetric fractions, as well as the crystalline phases evolution as a function of the applied temperature were determined from X-ray diffraction data. The structural modifications are responsible for drastic changes in the properties related to the ceramic performance. The thermal diffusivity results were correlated to the structural properties of the ceramic pieces, showing that this important thermal property can be used as a monitoring parameter of the quality of the final product.
© EDP Sciences 2005